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Q. 34

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Physics for Scientists and Engineers: A Strategic Approach with Modern Physics
Found in: Page 544

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Short Answer

|| A 10 m14 m house is built on a 12-cm-thick concrete slab.

What is the heat-loss rate through the slab if the ground temperature

is 5C while the interior of the house is 22C?

The power needed is 15.9 kW

See the step by step solution

Step by Step Solution

Step 1: Formula to use in this problem

For thermal conduction,

,

where dQ is the heat transferred in dt and dt is the time differential. If the time difference is unit,

Step 2: Rearrangement of the equation and finding of the power needed

As our surface is rectangular, A=ab, where a and b are the dimensions of the floor. So,

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